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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a64183402a8659942d8909102c9305de542ad6e252e7aca88c269ef8a82241' 
  AND token = 'CUgRuVqKi3sX0O0lfaCJDPm0lmsQqBC/47yCzQT2j9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}